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20.There______a number of books in the library and the number of them______increasing.(  )
A.has,isB.have,areC.are,isD.is,are

分析 在图书馆里有许多书,并且它们的数量正在增长.

解答 答案:C.
根据There______a number of books in the library and the number of them______increasing.可知这里考查了There be句型,表示"某地(或某时)存在有某人(或某物),而并非某地(某人、某物或某时)拥有什么东西",句中有若干个名词作主语,动词be常与后面主语中的第一个名词在数上一致.have一般表示某人有某物,故排除.a number of一些,许多;the number of…的数目.a number of…修饰可数名词复数,在这里a number of  books表示许多书,是一个复数形式,所以be动词应该用are,the number of…,表…的数量,作主语看做单数,所以be动词用is.故选C.

点评 本题考查了there be结构.解答时注意:a number of一些,许多;the number of…的数目.

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